8163A/B, 8164A/B, 8166A/B User’s Guide 129
Laser Sources 4
To modulate the lower wavelength source at 100 kHz using internal
modulation and the upper wavelength source using coherence control for
a Dual-Wavelength Laser Source module:
1 Move to the laser source channel and press the [Details] softkey.
2 Move to [λ] parameter and press Enter.
3 Select the lower wavelength source, for example, <1309.6>, using the
cursor key, and press Enter.
4 Move to the [Mod Frq] parameter for the lower wavelength source and
press Enter.
5 Enter 100.000 and press Enter.
6 Move to the [Mod Src] parameter for the lower wavelength source and
press Enter.
7Move to <Internal>, by using the cursor key, and press Enter. The text
Mod appears in the Laser Source channel.
8 Move to the [Mod Src] parameter for the upper wavelength source and
press Enter.
9Move to <Coherence Ctrl.>, by using the cursor key, and press Enter.
The text Mod is still displayed in the Laser Source channel.
10 Enable the laser output, by pressing the Active hardkey on the
module’s front panel.
If you choose to output both wavelengths of the 81554SM
Dual-Wavelength Laser Source and to modulate the optical output
signal, the two signals may be 180° out of phase with each other.
For 8165x Series Dual-Wavelength Laser Source modules, you can
choose independent modulation sources and independent modulation
frequencies for both wavelengths.
If you choose independent modulation sources for a Dual-Wavelength
Laser Source module, the text Mod will be displayed in the Laser Source
channel.
If you choose the same modulation sources for both wavelengths of a
Dual-Wavelength Laser Source module, the relevant text will be
displayed in the Laser Source channel, for example, Int if both
wavelengths use internal modulation.
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